The utility model provides a cutting ring soil sampler for hydrological field water-holding capacity measurement. Bearing plate, a soil taking mechanism is arranged on one side of the bearing plate; aloading mechanism for pushing the bearing plate and the soil sampling mechanism to move at a constant speed is arranged on the other side; a plurality of layers of soil sampling mechanisms are sequentially arranged on the bearing plate from top to bottom; each layer of soil sampling mechanism comprises a plurality of soil sampling assemblies located on the same horizontal line, each soil samplingassembly comprises a cutting ring and a cutting ring sleeve which are transversely arranged, the cutting rings are connected with the bearing plate through the cutting ring sleeves, the ends, away from the cutting ring sleeves, of the cutting rings are blade ends, and exhaust holes matched with the cutting rings are formed in the bearing plate. According to the utility model, the loading mechanism pushes the bearing plate, and then the thrust acts on the soil sampling mechanism, so that the soil sampling mechanism enters a hard soil layer at a constant speed, and meanwhile, the problem that the soil compactness is changed due to excessive striking force is solved.